Some results and insights on the performance gains of MIMO systems
Some results and insights on the performance gains of MIMO systems
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关于 MIMO 系统性能增益的一些结果和见解
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
V. Erceg
中科院分区：
文献类型：
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作者：
Severine Catreux;L. Greenstein;V. Erceg
根据提供的增益类型，多输入多输出(MIMO)系统通常分为两类：空间复用(SM)方法产生容量增益，而分集方法产生链路质量增益[这里通过后处理信噪比(SNR)来测量]。我们考虑每个类别的一组系统，通过解析或通过仿真来量化它们的增益，并展示这些增益如何随接收机输入信噪比和天线数量的变化而变化。这项工作的贡献在于闭合形式的分析结果和数值比较。我们强调了使用额外发射天线的好处，并比较了基于分集的MIMO方案和基于SM的MIMO方案。分析结果是针对一种基于分集的方案，该方案将发送侧的选择分集和接收侧的最大比合并(MRC)结合在一起，我们给出了其他基于分集的方案的SNR性能的上限。我们发现，对于实际的系统参数，基于分集的方案的相关信噪比度量比基于SM的方案高6-12dB。同时，基于SM的方案产生的容量度量比基于分集的方案高30%到两倍。
Multiple-input-multiple-output (MIMO) systems generally fall into two categories, depending on the kind of gain they provide: spatial multiplexing (SM) methods yield capacity gain and diversity methods yield link quality gain [measured here by the post-processing signal-to-noise ratio (SNR)]. We consider a set of systems from each category, quantify their gains analytically or via simulations, and show how these gains vary with the receiver input SNR and the numbers of antennas. The contribution of this work resides in both the closed-form analytical results and the numerical comparisons. We both highlight the benefits of using additional transmit antennas and provide comparisons among diversity-based and SM-based MIMO schemes. The analytical results are for a diversity-based scheme that combines selection diversity at the transmit side with maximum ratio combining (MRC) at the receive side, which we show to upper bound the SNR performance of other diversity-based schemes. We find that, for practical system parameters, the relevant SNR metric is 6-12 dB higher for the diversity-based schemes than for SM-based schemes. At the same time, SM-based schemes yield capacity metrics which range from 30% higher to double that of diversity-based schemes.